CVE-2024-3272Known exploitationPublic exploitNetwork attack vector

Unauthenticated CGI access via hard-coded credentials

Published Apr 4, 2024 · Updated Oct 21, 2025

Hard-coded credentials in all revisions of D-Link DNS-320L, DNS-325, DNS-327L, and DNS-340L allow remote attackers to bypass CGI authentication. The /cgi-bin/nas_sharing.cgi handler accepts user=messagebus with an empty passwd value as valid credentials instead of verifying a device-specific secret. Unauthenticated network access reaches the embedded account; paired with the separate command-injection flaw, it enables unauthorized code execution.

CVSS severity9.8
Critical
EPSS probability98.04%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in all revisions of D-Link DNS-320L, DNS-325, DNS-327L, and DNS-340L allow remote attackers to bypass CGI authentication. The /cgi-bin/nas_sharing.cgi handler accepts user=messagebus with an empty passwd value as valid credentials instead of verifying a device-specific secret. Unauthenticated network access reaches the embedded account; paired with the separate command-injection flaw, it enables unauthorized code execution.

The record

CVE
CVE-2024-3272
Published
Apr 4, 2024
Updated
Oct 21, 2025
Vendor
D-Link
Product
DNS-325
Classifications
CWE-798, T1078.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=20240403

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DNS-325version=20240403
D-Link · DNS-320Lversion=20240403
D-Link · DNS-340Lversion=20240403
D-Link · DNS-327Lversion=20240403

Published CVSS scores

9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8VulDB CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0VulDB CNAAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078.001Default Accounts

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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